答复: [PATCH 1/1] Add RISC-V TEE support

[liushiwei <liushiwei@eswincomputing.com>]

" Our hardware design referred to arm's trustzone technology",  The
translation software description may not be quite accurate, a hardware
technology like arm trustzone might be more better,  We want to submit a
piece of common hardware-independent code to opensbi, and then add
hardware-specific code controlled by configuration items to the common part,
Would you accept such a commit?

-----????-----
???: liushiwei [mailto:liushiwei at eswincomputing.com] 
????: 2023?1?11? 20:28
???: 'hchauhan at ventanamicro.com' <hchauhan@ventanamicro.com>;
'opensbi at lists.infradead.org' <opensbi@lists.infradead.org>
??: 'chenchaokai at eswincomputing.com' <chenchaokai@eswincomputing.com>
??: ??: [PATCH 1/1] Add RISC-V TEE support

Do you mean hardware? Our hardware design referred to arm's trustzone
technology. optee os is a software solution using arm trustzone hardware,
which mainly includes REE(linux), TEE(optee os), ATF(ARM Trusted firmware),
and then our software also developed these three parts. opensbi is similar
to ATF. whether if this is what you want?  The current committed code is not
hardware-dependent, but just continues the idea of this workaround, and we
may commit hardware-dependent code later.

-----????-----
???: hchauhan at ventanamicro.com [mailto:hchauhan at ventanamicro.com]
????: 2023?1?11? 20:03
???: 'liushiwei' <liushiwei@eswincomputing.com>; opensbi at lists.infradead.
org
??: chenchaokai at eswincomputing.com
??: RE: [PATCH 1/1] Add RISC-V TEE support

-----Original Message-----
> From: opensbi <opensbi-bounces@lists.infradead.org> On Behalf Of 
> liushiwei
> Sent: 11 January 2023 07:32
> To: opensbi at lists.infradead.org
> Cc: chenchaokai at eswincomputing.com; liushiwei
<liushiwei@eswincomputing.com>
> Subject: [PATCH 1/1] Add RISC-V TEE support

>RISC-V Trusted Executable Environment security software includes linux,
opensbi, and OP-TEE OS. linux is the non-secure domain, and OP-TEE OS is the
secure domain. At boot time, opensbi boots OP->TEE OS and then starts linux.
At runtime, opensbi acts as a secure monitor, responsible for context saving
and restoring when switching between linux and OP-TEE OS.
>TEE function is off by default, when using configuration is added in 
>the
config and objects file, such as platform/generic/configs/defconfig add
CONFIG_SBI_ECALL_TEE = y, In the >platform/generic/objects.mk add
CONFIG_TEE_LOAD_ADDR = 0x27c000000, CONFIG_TEE_LOAD_ADDR is the starting
address of the OP-TEE OS.

Hi Liushiwei,

Was there any formal specification or draft for this? Could you please point
me to the draft or specification?

Regards
Himanshu

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